Jess, Dardanus is a regeliocyclus or hybrid between a regelia and an oncocyclus, with dominant regelia traits. It is pure aril, but relatively easy to grow.
Jess, the climate that you describe sounds perfect for Dardanus and other arils and arilbreds. I grow Dardanus in wide and deep clay pots filled with a well draining soil with lots of sand and composted manure. On top of this soil I lay down two inches of coarse sand. The rhizomes lie on top of this sand and are covered with another inch of sand, so they are just covered. I water lightly in the fall, when it grows just a bit. In the winter I bring the pots inside and water once in a while so it doesn't become dessicated. In the spring, as soon as the weather warms, I bring the pots outside and water generously unless it rains. I also fertilize liberally as spring growth begins. After bloom, the plant gradually goes dormant. I bring the pots back inside and withhold all watering until the fall, when the growth cycle begins anew. I have an unheated sunroom for Dardanus, when it's not outside. It is completely winter hardy for at least zone 6.
Glad you ordered the rhizomes. In your climate you likely could grow them right in the ground. The flowers are just stunning! Here's another view:
